close

Вход

Забыли?

вход по аккаунту

?

Патент USA US3034374

код для вставки
May 15, 1962
w. STIEBER
3,034,365
FRICTION PRODUCING DEVICE FOR TRANSMITTING OR DESTROYING FORCES
Filed Sept. 4, 1958
2 Sheets-Sheet 1
“W
Fig.2
09.3
i
_
May 15, 1962
w. STIEBER
3,034,365
FRICTION PRODUCING DEVICE FOR TRANSMITTING 0R DESTROYING FORCES
Filed Sept. 4, 1958
2 Sheets-Sheet 2
/N VENTOR.
Wiwum Swat/z
by
4
'
fh'mm 5y.
3,?34,355
Patented May 15, 1962
2
.
3,h34,365
FRICTION PRODUQWG DEVICE FOR TRANS
MITTING GR DESTROYING FQRCES
Wilhelm Stieber, 20 Spitalstrasse, Weingarten,
Wurttemberg, Germany
Filed Sept. 4, 1958, Ser. No. 759,070
5 Claims. (Cl. 74-206)
The roller cage 1 with the rollers 2 is placed between fric
tion surfaces of elements, not shown, between which a
force is to be transmitted. These surfaces are parallel to
the platelike cage 1 and are pressed against the rollers by
conventional means, not shown. The friction surfaces
move relatively to each other in the direction of the ar
rows shown on top of FIG. 1. The driving surface moves
the rollers 2 with their cage 1 in the direction of one of the
arrows. The rollers roll thereby on the other surface
The present invention relates to a device for producing
10 which may be assumed to be stationary. As seen in FIG.
friction for transmitting or destroying forces.
1 the rotation axes of the rollers are placed at an angle w
Conventional devices for producing friction are char
relatively to the direction of movement of the driving sur
acterized by surfaces sliding upon one another. The
face. The inclination of the axes of one group of rollers
friction coe?icient of these devices depends on the tem
may be clockwise and the inclination of another group
perature and on the lubrication of the surfaces which glide
one on the other. The heat generated by friction cannot 15 may be counterclockwise. Due to their inclined posi
‘always be sufliciently dissipated to prevent deterioration
of the devices caused by excessive temperatures.
tion, the rollers do not only perform a rolling movement
but also a sliding movement so that sliding friction is
produced between the circumferential surface of the roll
An object of the present invention resides in the pro
vision of friction producing devices which avoid the afore
ers and the frictional surfaces between which the rollers
said disadvantages of conventional devices. According 20 operate. This causes movement of the second frictional
to the invention rollers are interposed between the fric
tion producing surfaces which rollers are pressed by said
surface in the direction of the movement of the first or
driving surface and a power transmission from the ?rst
surface to the second surface. The component of the
sliding movement depends on the angle which is formed
relative movement of the surfaces. The rollers are guided
to move in the direction of movement of the driving sur 25 by the axes of the rollers and the direction of movement
of the roller cage. The component of the rolling move
face. The guide, however, is so constructed that the
surfaces and roll as well as glide on the surfaces upon
axes of the rollers are inclined to the direction of move
ment of the driving surface, the angle of the inclination
being smaller than 90“. Therefore, the rollers do not
only roll but also glide in the direction of their longi
tudinal axes. The so produced gliding friction between
the surface of the rollers and the surface engaged there—
by is utilized for transmitting or destroying forces. The
shape of the rollers may be cylindrical, conical, ball-like
ment corresponds approximately to the sine of this angle
and the component of the sliding movement corresponds
approximately to the cosine of this angle. By suitable
choice of the inclination of the axes of the rollers with
respect to the direction of the movement of the roller
cage the relation between the rolling and sliding move
ments can be predetermined.
The rollers of each group frictionally engage each
or of any other suitable con?guration, depending on the 35 other whereby the force destroying and transmitting effect
individual requirements. The rollers are preferably
guided by a cage or other suitable device.
The cage may
is enhanced.
'
In the embodiment illustrated in FIG. 1 the longitudinal
axes of the rollers 2 are situated in planes which are paral
'
The invention relates more particularly to arrangements
lel to the surfaces of the roller cage 1. The later may be
in which the rollers are arranged in groups of adjacent
made so, thick and the apertures may be so shaped that
and parallel rollers and to clutches having conical clutch
a plurality of rollers can be so arranged that their rotation
axes are in planes which are at a right angle to the plane
faces with caged rollers therebetween as well as to clutches
in which one of the mating clutch parts forms a cage for
of the cage v1. This modi?cation is illustrated in FIG. 7
as applied to a device for transmitting torque.
the rollers.
FIG. 2 illustrates a device for transmitting torque. The
The novel features which are considered characteristic 45
apparatus includes a rolled cage 3 having six rectangular
of the invention are set forth with particularity in the ap
apertures, each aperture accommodating one roller 2.
pended claims. The invention itself, however, and addi
The inclination of the long axes of the rectangular aper-'
tional objects and advantages thereof will best be under
stood from the following description of embodiments
tures with respect to the radii on which the apertures are
located is the same for all apertures, i.e., the angles wl
thereof when read in connection with the'accompanying
formed by the rotation aXes of the rollers 2 and a tan
drawing, in which:
gent on a circle de?ning the path of the rollers are equal.
FIG. 1 is a'diagrammatic top view of a force transmit
The roller cage 3 is rotated in the same direction in
ting or destroying element according to the invention
which moves on a straight line relative to another element 55 which the torque is transmitted. The roller cage with
the rollers is disposed between the surface of a driving
which is not shown.
element and the surface of a driven element which ele
FIG. 2 is a diagrammatic top view of an element ac
consist of one or more parts.
ments are not shown and are guided to rotate coaxially
cording to the invention for transmitting torque.
of the roller cage 3.
FIG. 3 is a diagrammatic top view of a modi?cation of
FIG. 3 illustrates a modi?cation of the device shown
the element shown in FIG. 2.
60 in FIG. 2. The apertures in a roller cage 13 are so
FIG. 4 is a diametrical sectional view of a modi?ca
shaped as to individually accommodate three rollers 2
tion of the torque transmitting device shown in FIG. 2.
whereby the angles formed by the taxes (of the rollers
FIG. 5 is a plan view of the roller cage and rollers of
and the direction of circumferential movement of the
the torque transmitting device shown in FIG. 4.
rollers is diiferent in different apertures. For example,
FIG. 6 is a diametrical sectional view of a modi?cation 65 the angle W2 formed by the rollers in the aperture 14 and
of the torque transmitting device shown in FIGS. 4 and 5.
i?cation of a torque transmitting'device according to the
the direction of movement of the rollers is smaller than
the angle W3 formed by the rotation axes of the rollers
in the aperture 15 and the direction of movement of
invention.
the rollers.
FIG. 7 is a diametrical sectional View of a further mod
'
'
Referring more particularly to FIG. 1 of the drawing, 70
In the modi?ed torque transmitting device shown in
numeral 1 designates a platelike roller cage having four
FIGS. 4 and 5 the cage 21 holding the rollers 22 and
openings, each opening accommodating three rollers 2. the friction surfaces 23' and 24' of the adjacent ele
epegeee
3
4 .
I merits 23 and 24 have a conical shape. The surfaces 23'
engagement more than 99% of the operating time of
the device. It is, therefore, easily possible to eifect a
continuousv cooling of the frictional surfaces and a very
e?icient removal of frictional heat by conventional cool
and 24' are parallel to the cage 21 and pressed, by means
not shown, against the rollers 22, which are barrel shaped.
The angle k formed by the conical surfaces 23' and 24’.
‘with the rotation axis of the device is alwaysvlarger than
ing means which pass a liquid or gaseous coolant between
7 the angle of friction and normally greater than 40 degrees.
the rollers and the surfaces engaged by the rollers. Due.
to the lapping eifect and the possibility of a highly ef
The size of the angle w shown in’ FIGS. 1, 2, 3 and
5 ranges generally between 20 and 70 degrees.
?cient heat removal directly from the engaged surfaces,
In the modi?cation illustrated in FIG. 6 the rollers
the clutch may slide for a considerable period of time
25 are in the form of needle rollers. They are guided 10 at full torque without adverse effect. Because there is
by a cage 28 having a conical shape and being located _ only linear engagement and no engagement of broad sur
between similarly shaped surfaces 26’ and 27' of elements
faces, formation of an oil film as in conventional lubri
26 and 27. Because of their small diameter, the needle
cated friction clutches is not possible. ‘Therefore, the
rollers are capable of being bent by the increasing pres
changeover from relative movement of the force or torque
sure of the'coneshaped surfaces 26' and 27' of the ele r15 transmitting elements to relative standstill is steady and
ments 26 and 27 till they closely engage these surfaces.
without shock. The friction coe?icient of the device ac
In this case the friction force increases smoothly and
cording to the invention is substantially independent of
Without knocking.
' ,
lubrication and quality of lubricants.
FIG. 7 illustrates a device having a roller cage 56
formed by a ?ange at the end of a driving shaft 51.
The ?ange is of sufficient thickness to accommodate two
’
,
In view of the aforesaid advantages the apparatus ac
cording to the invention is particularly well adapted for
use in adjustable clutches, for use in sliding clutches,
adjacent parallel rollers 52 in suitable apertures 57 in
the disc or ?ange 56. The apertures 57 may be shaped
for overload protective devices, in devices for damping
vibrations, in shock absorbers and brakes, and also in
in the same manner as the apertures in the roller cages
shown in FIG. 2 or in FIG. 3. The axes of the two 25 testing apparatus for determining friction coefficients.
I claim:
rollers in the same opening are located in a plane which
1. A torque transmitting device comprising a driving
element and a driven element, said elements being rotat
is’ parallel to the rotation axis ,of the device. Whereas
in FIG. 3 the axes of the rollers are in a plane which is
able on a common rotation axis and having opposed
of the rollers 52, which are in the same aperture, of 30 coaxial cone-shaped surfaces whose axes coincide with
the rotation axis of said elements and form an angle of
the embodiment'shown in FIG. 7 are in a plane which
parallel to the planes of thefriction surfaces, the axes
is normal to the planes of the friction surfaces 53' and
at least 40° with said axis, rollers interposed between said
able in a cylindrical extension of the ?ange 54 which
tion axis of the device to said rollers which angle is
smaller than 90° for producing friction between said
rollers and said surfaces in the direction of the longitudi~
surfaces, and guide means for said rollers including
S4’ of parts 53 and 54. The surface 54' is on a ?ange
means for positioning the rotation axes of said rollers at
54 at the end of a driven shaft 55. The surface 53' is on
one side of an annular member 53 which is axially mov 35 an angle relatively to the radii extending from the rota
extension accommodates the ?ange‘ 56. The element 53
is pressed against the surface 54' by a resilient means 58
nal axes of the rollers.
generally shown as a rubber ring. There is a rolling fric
tion between the rollers 52 and the surfaces 53’ and 54’. 40 '2. A friction device comprising a rotatable driving
Since the axes of the rollers are inclined to the'respective
element, a rotatable driven element placed coaxially of
radii of the ?ange se on which the apertures 57 are lo~
said driving element, one of said elements having two
cated there is also sliding friction which tends to take
vaxially spaced radial surfaces, and rollers interposed be
along the members 53 and 54 upon rotation of the drive
tween said surfaces, the other of said elements having a
shaft 51.
45 portion interposed ‘between said surfaces and forming a
The forces and moments transmitted by the devices
cage for said rollers, ‘said portion including means for
> shown in FIGS. 1 to 7 are proportional to-the pressures
positioning the rotation axes of said rollers at an angle -
P. If conventional devices are provided for changing or
relatively to the radiiv extending from the rotation axis
releasing these pressures the transmitted forces or me
of the device to said rollers which-angle is smaller than
ments are changed or released accordingly.
50 90° for producing friction between saidlrollers and said
The devices according to the invention may be used
surfaces in the direction of the longitudinal axes of the
individually or may be arranged in pairs or greater num
bers in the manner as used in conventional larnellar
r '3. A friction producing device for transmitting or de
clutches whereby the transmitted force or torque is in
stroying forces, comprising a driving element and a driv
rollers.
_
'
en element, said elements having opposed surfaces, rollers
Aside from the aforedescribed characteristics the fric-, 55 interposed between said surfaces, and guide means for
tion element according to the invention has the following
said rollers including means for positioning the rotation
creased.
'
'
7
advantages:
axes of said rollers at an angle relatively to the direction
The movement of the rollerswhich is the resultant '
of movement of said driving element which angle is
of a rolling and of a sliding movement, relatively to the
smaller than ‘90° for guiding the rollers to roll around
60
friction surfaces on which the rollers roll and slide, has
their longitudinal axes and to simultaneously glide rela
a lapping effect whereby the friction surfaces are con
tively to said surfaces in the direction of the longitudinal
tinuously improved and wear is reduced or entirely
axes of the rollers, said rollers being arranged in a plane
which is parallel to said surfacesand in groups with the
avoided.
'
.
'
By using suitable material, for example, hardened
steel, the composite movement of the rollers affords
transmission of forces which forces are a multiple of the
forces which can be transmitted by a conventional clutch
of similar dimensions.
,
,
'7
v
,7
'
65
rollers of each group placed parallel to and frictionally
engaging each other. 7
.
'-
‘
4. A friction. device comprising a driving disc and a
driven’ disc, said discs being placed in coaxial relation and
having opposed surfaces, oblong rollers interposed be
Because of the rotation of the, rollers the periods dur
70 tween. said surfaces, and a disc-like cage coaxially inter
ing ‘which the frictional surfaces are in engagement are
posed between said .discsand including means for posi
brief. The period of time available for cooling each
frictional surface portion is more than‘hundredfold the
time during which the surface portion is heated while
, tioning the rotation axes of said rollers generally radially
of the device and at a'slant to the-direction of movement
of said driving disc for guiding the rollers to roll around
it'transrnits a force. The frictional surfaces are out of 75 their longitudinal axes and to simultaneously glide rela
8,034,865
tively to said surfaces in the direction of the longitudinal
axes of the rollers.
5. A friction device as de?ned in claim 4 wherein said
cage is in the form of a plate having apertures receiving
5
and ?tting said rollers.
References Cited in the ?le of this patent
UNITED STATES PATENTS
970,995
Dill ________________ __ Sept. 20, 1910
1,141,508
1,410,722
1,540,737
1,955,879
2,163,066
2,490,525
6
Weiss ___, ____________ __ June 1, 1915
Rogers ______________ __ Mar. 28, 1922
Connet _______________ __ June 2, 1925
Griswold ____________ __ Apr. 24, 1934
Searcy ____ __> _____ ______ June 20, 1939
Keller ________ -1 _____ __ Dec. 6, 1949
Документ
Категория
Без категории
Просмотров
0
Размер файла
480 Кб
Теги
1/--страниц
Пожаловаться на содержимое документа